Injection height for biomass burning emissions from boreal forest fires Fok-Yan Leung
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Injection height for biomass burning emissions from boreal forest fires
We began by looking at emissions estimates for 1998 boreal fires, which vary significantly.Comparison of surface and column data from 1998 with results of GEOS-Chem simulationsDuring intense boreal fires, intense heat can result in lofting of emissions well above the boundary layerPutting large fraction of emissions in free troposphere reconciled model results with both surface and column data
Conclusions from study of 1998 study: Injection of biomass burning emissions in the free troposphere are necessary to reconcile ground and column data Injection of biomass burning emissions in free troposphere results in higher tropospheric ozone throughout the northern hemisphere due to longer sequestration of NOx by PAN formation. Preliminary studies suggest that model results are not particularly sensitive to the exact fractional split of emissions (Turquety et al., [2007], and unpublished work) We were motivated to move beyond the “sensitivity analysis” level, and to our ongoing study of plume heights using the MISR instrumentUsing the MISR InstrumentWe look at discrete plumes from fires. Algorithm of Mazzoni and Nelson:
Kahn et al, [2006] observed clear relationship between atmospheric stability and observed plume heights. We compare the stability profiles calculated using the coarser GEOS4 data with the finer resolution BRAMS data, at the 66 sites
Stability profiles: BRAMS (courtesy Marcos Longo) and GEOS4: “Neutral” profiles and profiles with regions of high stability
Example of plume in trapped in a layer of high stabilityDirections: Moving forward
S1: Modeling fire plumes is actually a quite well defined problem
S2: Effect of PAN on ozone chemistryImplications for ozone chemistry – the effect of PAN carried aloft.S3: Comparing 66 plume histograms to stability profiles derived from GEOS4 data:S4: Comparing 66 plume histograms to stability profiles derived from BRAMS data:S5:Comparing 66 plume histograms to stability profiles derived from BRAMS and GEOS4 data: BRAMS/GEOS4S6: GEOS4 vs. BRAMS stability profiles
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